1/*
2 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
3 * Digest Algorithm, as defined in RFC 1321.
4 * Copyright (C) Paul Johnston 1999 - 2000.
5 * Updated by Greg Holt 2000 - 2001. * See http://pajhome.org.uk/site/legal.html for details.
6 */
7/*
8 * Convert a 32-bit number to a hex string with ls-byte first
9 */
10var hex_chr = "0123456789abcdef";
11function rhex(num)
12{
13  var str = "";
14  for(var j = 0; j <= 3; j++)
15    str += hex_chr.charAt((num >> (j * 8 + 4)) & 0x0F) +
16           hex_chr.charAt((num >> (j * 8)) & 0x0F);
17  return str;
18}
19
20
21/*
22 * Convert a string to a sequence of 16-word blocks, stored as an array.
23 * Append padding bits and the length, as described in the MD5 standard.
24 */
25function str2blks_MD5(str)
26{
27  var nblk = ((str.length + 8) >> 6) + 1; // number of 16-word blocks
28  var blks = new Array(nblk * 16);
29  for(var i = 0; i < nblk * 16; i++) blks[i] = 0;
30  for(var i = 0; i < str.length; i++)
31    blks[i >> 2] |= str.charCodeAt(i) << ((i % 4) * 8);
32  blks[i >> 2] |= 0x80 << ((i % 4) * 8);
33  blks[nblk * 16 - 2] = str.length * 8;
34  return blks;
35}
36
37
38/*
39 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
40 * to work around bugs in some JS interpreters.
41 */
42function safe_add(x, y)
43{
44  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
45  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
46  return (msw << 16) | (lsw & 0xFFFF);
47}
48
49
50/*
51 * Bitwise rotate a 32-bit number to the left
52 */
53function rol(num, cnt)
54{
55  return (num << cnt) | (num >>> (32 - cnt));
56}
57
58
59/*
60 * These functions implement the basic operation for each round of the
61 * algorithm.
62 */
63function cmn(q, a, b, x, s, t)
64{
65  return safe_add(rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
66}
67function ff(a, b, c, d, x, s, t)
68{
69  return cmn((b & c) | ((~b) & d), a, b, x, s, t);
70}
71function gg(a, b, c, d, x, s, t)
72{
73  return cmn((b & d) | (c & (~d)), a, b, x, s, t);
74}
75function hh(a, b, c, d, x, s, t)
76{
77  return cmn(b ^ c ^ d, a, b, x, s, t);
78}
79function ii(a, b, c, d, x, s, t)
80{
81  return cmn(c ^ (b | (~d)), a, b, x, s, t);
82}
83
84
85/*
86 * Take a string and return the hex representation of its MD5.
87 */
88function calcMD5(str)
89{
90  var x = str2blks_MD5(str);
91  var a = 1732584193;
92  var b = -271733879;
93  var c = -1732584194;
94  var d = 271733878;
95
96
97  for(i = 0; i < x.length; i += 16)
98  {
99    var olda = a;
100    var oldb = b;
101    var oldc = c;
102    var oldd = d;
103
104
105    a = ff(a, b, c, d, x[i+ 0], 7 , -680876936);
106    d = ff(d, a, b, c, x[i+ 1], 12, -389564586);
107    c = ff(c, d, a, b, x[i+ 2], 17, 606105819);
108    b = ff(b, c, d, a, x[i+ 3], 22, -1044525330);
109    a = ff(a, b, c, d, x[i+ 4], 7 , -176418897);
110    d = ff(d, a, b, c, x[i+ 5], 12, 1200080426);
111    c = ff(c, d, a, b, x[i+ 6], 17, -1473231341);
112    b = ff(b, c, d, a, x[i+ 7], 22, -45705983);
113    a = ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
114    d = ff(d, a, b, c, x[i+ 9], 12, -1958414417);
115    c = ff(c, d, a, b, x[i+10], 17, -42063);
116    b = ff(b, c, d, a, x[i+11], 22, -1990404162);
117    a = ff(a, b, c, d, x[i+12], 7 , 1804603682);
118    d = ff(d, a, b, c, x[i+13], 12, -40341101);
119    c = ff(c, d, a, b, x[i+14], 17, -1502002290);
120    b = ff(b, c, d, a, x[i+15], 22, 1236535329);
121
122
123    a = gg(a, b, c, d, x[i+ 1], 5 , -165796510);
124    d = gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
125    c = gg(c, d, a, b, x[i+11], 14, 643717713);
126    b = gg(b, c, d, a, x[i+ 0], 20, -373897302);
127    a = gg(a, b, c, d, x[i+ 5], 5 , -701558691);
128    d = gg(d, a, b, c, x[i+10], 9 , 38016083);
129    c = gg(c, d, a, b, x[i+15], 14, -660478335);
130    b = gg(b, c, d, a, x[i+ 4], 20, -405537848);
131    a = gg(a, b, c, d, x[i+ 9], 5 , 568446438);
132    d = gg(d, a, b, c, x[i+14], 9 , -1019803690);
133    c = gg(c, d, a, b, x[i+ 3], 14, -187363961);
134    b = gg(b, c, d, a, x[i+ 8], 20, 1163531501);
135    a = gg(a, b, c, d, x[i+13], 5 , -1444681467);
136    d = gg(d, a, b, c, x[i+ 2], 9 , -51403784);
137    c = gg(c, d, a, b, x[i+ 7], 14, 1735328473);
138    b = gg(b, c, d, a, x[i+12], 20, -1926607734);
139
140
141    a = hh(a, b, c, d, x[i+ 5], 4 , -378558);
142    d = hh(d, a, b, c, x[i+ 8], 11, -2022574463);
143    c = hh(c, d, a, b, x[i+11], 16, 1839030562);
144    b = hh(b, c, d, a, x[i+14], 23, -35309556);
145    a = hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
146    d = hh(d, a, b, c, x[i+ 4], 11, 1272893353);
147    c = hh(c, d, a, b, x[i+ 7], 16, -155497632);
148    b = hh(b, c, d, a, x[i+10], 23, -1094730640);
149    a = hh(a, b, c, d, x[i+13], 4 , 681279174);
150    d = hh(d, a, b, c, x[i+ 0], 11, -358537222);
151    c = hh(c, d, a, b, x[i+ 3], 16, -722521979);
152    b = hh(b, c, d, a, x[i+ 6], 23, 76029189);
153    a = hh(a, b, c, d, x[i+ 9], 4 , -640364487);
154    d = hh(d, a, b, c, x[i+12], 11, -421815835);
155    c = hh(c, d, a, b, x[i+15], 16, 530742520);
156    b = hh(b, c, d, a, x[i+ 2], 23, -995338651);
157
158
159    a = ii(a, b, c, d, x[i+ 0], 6 , -198630844);
160    d = ii(d, a, b, c, x[i+ 7], 10, 1126891415);
161    c = ii(c, d, a, b, x[i+14], 15, -1416354905);
162    b = ii(b, c, d, a, x[i+ 5], 21, -57434055);
163    a = ii(a, b, c, d, x[i+12], 6 , 1700485571);
164    d = ii(d, a, b, c, x[i+ 3], 10, -1894986606);
165    c = ii(c, d, a, b, x[i+10], 15, -1051523);
166    b = ii(b, c, d, a, x[i+ 1], 21, -2054922799);
167    a = ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
168    d = ii(d, a, b, c, x[i+15], 10, -30611744);
169    c = ii(c, d, a, b, x[i+ 6], 15, -1560198380);
170    b = ii(b, c, d, a, x[i+13], 21, 1309151649);
171    a = ii(a, b, c, d, x[i+ 4], 6 , -145523070);
172    d = ii(d, a, b, c, x[i+11], 10, -1120210379);
173    c = ii(c, d, a, b, x[i+ 2], 15, 718787259);
174    b = ii(b, c, d, a, x[i+ 9], 21, -343485551);
175
176
177    a = safe_add(a, olda);
178    b = safe_add(b, oldb);
179    c = safe_add(c, oldc);
180    d = safe_add(d, oldd);
181  }
182  return rhex(a) + rhex(b) + rhex(c) + rhex(d);
183}
184function isIE()
185{
186    var browser = new Object();
187    browser.version = parseInt(navigator.appVersion);
188    browser.isNs = false;
189    browser.isIe = false;
190    if(navigator.appName.indexOf("Netscape") != -1)
191        browser.isNs = true;
192    else if(navigator.appName.indexOf("Microsoft") != -1)
193        browser.isIe = true;
194    if(browser.isNs)
195        return false;
196    else if (browser.isIe)
197        return true;
198}
199
200